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//
//
//

final public class Cons extends LispObject{
  LispObject carContent,cdrContent;
  Cons(LispObject carContent, LispObject cdrContent){
    this.carContent=carContent;
    this.cdrContent=cdrContent;
  }
  public int getType(){ return CONS; }
  public LispObject car(){ return carContent; }
  public LispObject cdr(){ return cdrContent; }
  public void setCar(LispObject a){ carContent=a; }
  public void setCdr(LispObject a){ cdrContent=a; }
  public String toString(){ 
    String ret="(";
    LispObject l=this;
    while(true){
      ret+=((Cons)l).car().toString();
      l=((Cons)l).cdr();
      if(l.getType()!=CONS) break;
      ret+=" ";
    }
    if(l == Symbol.nil) return ret+")";
    else return ret+" . "+l.toString()+")";
  }
}